Abstract
Local structural development in the bulk metallic glass (Fe0.5Co0.5)72B20Si4Nb4 on annealing has been investigated using transmission electron microscopy. Nanoscale crystalline grains with the Fe23B6-type structure were densely formed during annealing around the first crystallization temperature. In the state prior to the crystallization (below Tg), we found extended medium range ordered (MRO) regions as small as 2 nm with an extremely high density in the glass matrix. The nanocrystallized microstructure is presumably ascribed to the presence of the dense MRO regions. On the basis of nanobeam diffraction analysis, however, it was found that most of the MRO regions have no clear order of the Fe23B6-type structure. The clear Fe23B6 order was found in regions extending as large as 5 nm at a higher temperature (around Tg). A relationship between the structural change and the glass stability is discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 491-497 |
| Number of pages | 7 |
| Journal | Intermetallics |
| Volume | 16 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2008 Apr 1 |
| Externally published | Yes |
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Keywords
- B. Glasses, metallic
- F. Diffraction
- F. Electron microscopy, transmission
ASJC Scopus subject areas
- Metals and Alloys
Cite this
Nanocrystallization of complex Fe23B6-type structure in glassy Fe-Co-B-Si-Nb alloy. / Hirata, Akihiko; Hirotsu, Yoshihiko; Amiya, Kenji; Nishiyama, Nobuyuki; Inoue, Akihisa.
In: Intermetallics, Vol. 16, No. 4, 01.04.2008, p. 491-497.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Nanocrystallization of complex Fe23B6-type structure in glassy Fe-Co-B-Si-Nb alloy
AU - Hirata, Akihiko
AU - Hirotsu, Yoshihiko
AU - Amiya, Kenji
AU - Nishiyama, Nobuyuki
AU - Inoue, Akihisa
PY - 2008/4/1
Y1 - 2008/4/1
N2 - Local structural development in the bulk metallic glass (Fe0.5Co0.5)72B20Si4Nb4 on annealing has been investigated using transmission electron microscopy. Nanoscale crystalline grains with the Fe23B6-type structure were densely formed during annealing around the first crystallization temperature. In the state prior to the crystallization (below Tg), we found extended medium range ordered (MRO) regions as small as 2 nm with an extremely high density in the glass matrix. The nanocrystallized microstructure is presumably ascribed to the presence of the dense MRO regions. On the basis of nanobeam diffraction analysis, however, it was found that most of the MRO regions have no clear order of the Fe23B6-type structure. The clear Fe23B6 order was found in regions extending as large as 5 nm at a higher temperature (around Tg). A relationship between the structural change and the glass stability is discussed.
AB - Local structural development in the bulk metallic glass (Fe0.5Co0.5)72B20Si4Nb4 on annealing has been investigated using transmission electron microscopy. Nanoscale crystalline grains with the Fe23B6-type structure were densely formed during annealing around the first crystallization temperature. In the state prior to the crystallization (below Tg), we found extended medium range ordered (MRO) regions as small as 2 nm with an extremely high density in the glass matrix. The nanocrystallized microstructure is presumably ascribed to the presence of the dense MRO regions. On the basis of nanobeam diffraction analysis, however, it was found that most of the MRO regions have no clear order of the Fe23B6-type structure. The clear Fe23B6 order was found in regions extending as large as 5 nm at a higher temperature (around Tg). A relationship between the structural change and the glass stability is discussed.
KW - B. Glasses, metallic
KW - F. Diffraction
KW - F. Electron microscopy, transmission
UR - http://www.scopus.com/inward/record.url?scp=40849087595&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=40849087595&partnerID=8YFLogxK
U2 - 10.1016/j.intermet.2007.11.006
DO - 10.1016/j.intermet.2007.11.006
M3 - Article
VL - 16
SP - 491
EP - 497
JO - Intermetallics
JF - Intermetallics
SN - 0966-9795
IS - 4
ER -